Which amendment did some americans criticize as not going far enough to make suffrage universal?

It would be the fifteenth amendment. As you may know, the fifteen amendment was passed, and it prohibited the federal and state governments from denying a citizen the right to vote based on that citizen's "race, color, or previous condition of servitude". Why do we still say it didn't make suffrage universal? Because if you were a woman, you were still not allowed to vote. Not until the 19th amendment

Ibelieve the answer is d